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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2010-08-14 20:45:13 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2010-08-19 01:32:53 +0200 |
| commit | 7ae07ea3a48d30689ee037cb136bc21f0b37d8ae (patch) | |
| tree | 2cb895a0794bcb2e45a4f48ef7e93302c1f6332c /include/linux/perf_event.h | |
| parent | 927c7a9e92c4f69097a6e9e086d11fc2f8a5b40b (diff) | |
| download | lwn-7ae07ea3a48d30689ee037cb136bc21f0b37d8ae.tar.gz lwn-7ae07ea3a48d30689ee037cb136bc21f0b37d8ae.zip | |
perf: Humanize the number of contexts
Instead of hardcoding the number of contexts for the recursions
barriers, define a cpp constant to make the code more
self-explanatory.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
Diffstat (limited to 'include/linux/perf_event.h')
| -rw-r--r-- | include/linux/perf_event.h | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index d7e8ea690864..ae6fa6050925 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -808,6 +808,12 @@ struct perf_event_context { struct rcu_head rcu_head; }; +/* + * Number of contexts where an event can trigger: + * task, softirq, hardirq, nmi. + */ +#define PERF_NR_CONTEXTS 4 + /** * struct perf_event_cpu_context - per cpu event context structure */ @@ -821,12 +827,8 @@ struct perf_cpu_context { struct mutex hlist_mutex; int hlist_refcount; - /* - * Recursion avoidance: - * - * task, softirq, irq, nmi context - */ - int recursion[4]; + /* Recursion avoidance in each contexts */ + int recursion[PERF_NR_CONTEXTS]; }; struct perf_output_handle { |